The cellophane films were grafted with PAN for various time durations in magnetron enhanced air plasma. A magnetron-coupled plasma system was developed for the purpose. The rates of polymer deposition and etching were studied. The changes occurring in the angle of contact of water were studied. The attenuated total reflection-infrared spectroscopic studies confirmed the grafting of cellophane surface by polyacrylonitrile (PAN). The water vapor transmission rates through the grafted samples were also studied.